Haider ع. ا. The essential relations in theorem of 2F mappings between Remannian spaces which have structure (F\(^3\) )=0. University of Aden Journal of Natural and Applied Sciences, [S. l.], v. 22, n. 1, p. 51–58, 2018. DOI: 10.47372/uajnas.2018.n1.a05. Disponível em: https://uajnas.adenuniv.com/index.php/uajnas/article/view/159. Acesso em: 3 apr. 2025.